New substituted thiocarbamates

ABSTRACT

A compound of the formula:   WHEREIN N IS AN INTEGER OF FROM 0 TO 5; X is selected from the group consisting of a halogen, an aliphatic radial, nitro, acyl, acyloxy, hydroxy and alkoxy; Y is selected from the group consisting of hydrogen, alkyl, phenyl and a carbamoyl radical of the formula:   WHEREIN R1 and R2 independently are selected from the group consisting of hydrogen, alkyl and phenyl; and Z is selected from the group consisting of an aliphatic radical, a cycloaliphatic radical, aryl and aralkyl. These compounds are useful as fungicides and nematocides.

United States Patent [54] NEW SUBSTITUTED THIOCARBAMATES 10 Claims, No Drawings [52] U.S.Cl 260/455 A, 260/453 R, 424/298, 424/300 [51] lnt.Cl ....C07c 155/08 [50] Field of Search 260/453, 455 A, 471 C; 424/300; 71/100 [56] References Cited UNITED STATES PATENTS 3,21 1,770 10/1965 Pyne 424/300 3,301,885 [/1967 Richter et a1. 71/100 2,863,899 12/1958 Harris 260/455 2,983,747 5/1961 Campbell et al. 260/455 3,066,021 1 1/1962 Beaver et al. 260/455 3,230,243 1/1966 DAmico 260/455 3,288,832 11/1966 Stoffel 260/455 FOREIGN PATENTS 1,060,135 3/1967 Great Britain 260/471 C OTHER REFERENCES Gorskaya et al., Derivatives of Arylhydroxylamines (1965) CA64 p. 2006 (1966) Luengo, Biol. Assoc. Natl. lngrs., Urethanos O Carbamatos Pesticides," volume 1, number 141, pp. ll- 21, (1963).

Metcalf, Organic Insecticides, pp. 317- 329, (1955).

Primary ExaminerElbert L. Roberts Assistant ExaminerG. Hollrah Att0rneyRohert .I. Schwarz ABSTRACT: A compound of the formula:

site? te e aa.

wherein R and R independently are selected from the group consisting of hydrogen, alkyl and phenyl; and Z is selected .from the group consisting of an aliphatic radical, a

cycloaliphatic radical, aryl and aralkyl. These compounds are useful as fungicides and nematocides.

NEW SUBSTITUTED THIOCARBAMATES This invention relates to new compounds and to pesticidal compositions containing such compounds as well as to methods of using such compositions to control posts The compounds of this invention can be represented by the following formula:

wherein n is an integer from O to 5; X is selected from the group consisting of halogen, an aliphatic radical, nitro, acyl, acyloxy, hydroxy, and alkoxy, and when n is greater than one X can be the same or different, Y is selected from the group consisting of hydrogen, alkyl, phenyl, and a carbamoyl radical of the formula:

wherein R and R independently are selected from the group consisting of hydrogen, alkyl and phenyl; and Z is selected from the group consisting of an aliphatic radical, a cycloaliphatic radical, aryl and aralkyl. The compounds represented by the above general formula are effective as pesticides, and particularly as fungicides, and nematocides.

The compounds of this invention can be prepared by one or more general reactive steps depending upon the particular compounds desired. When compounds are desired where Y of formula I is hydrogen, that is an N-phenyl-N-hydroxythicocarbamate, then an N-phenyl hydroxylamine of the formula:

can be reacted with an ester of chlorthioformic acid of the formula:

wherein X, n and Z have the same significance as for formula I above. For example, X can be halo such as chloro, bromo, iodo or fluoro; an aliphatic radical, such as alkyl of from one to about five carbon atoms or alkenyl of from two to about five carbon atoms; nitro; acyl or acyloxy such as saturated or unsaturated acyl or acyloxy containing from one to about five carbon atoms; hydroxy; or alkoxy such as alkoxy containing from one to about five carbon atoms; and Z can be an aliphatic radical such as alkyl of from one to about five carbon atoms, alkenyl or alkynyl of from two to about five carbon atoms; a cycloaliphatic radical such as cycloalkyl or cycloalkenyl of from five to about seven carbon atoms; aryl such as phenyl or napthyl or aralkyl such as phenyl substituted alkyl where the alkyl group contains from one to about five carbon atoms. When compounds represented by formula I are desired having Y other than hydrogen, then an N-phenyl-N-hydroxythiocarbamate. prepared as above, can be further reacted to form the compounds with the desired Y substituent. For example, when compounds of formula I are desired where Y is a carbamoyl radical of the formula:

wherein R and R, are independently selected from the group consisting of hydrogen, phenyl or an alkyl group of from one to about five carbon atoms, then the corresponding N-hydroxy-carbamate can be reacted with a suitable isocyanate or carbamoyl chloride. When compounds are desired where Y is phenyl or an alkyl group of from one to about five carbon atoms, then a corresponding N-phenyl-N-hydroxythiocarbamate can be O-alkylated with an appropriate alkylating agent containing the desired Y substituent.

The substituents, X, Y and Z of formula I which are illustrated above, can also be substituted, where possible, with such groups as halogen, hydroxy, alkoxy, acyl, acyloxy, nitro or combinations thereof. For example, X can be haloalkyl, such as chloromethyl, trifluormethyl; hydroxyalkyl, such as 3- hydroxypropyl; nitroalkyl, such as 2-nitroethyl; haloacyl, such as trichloroacetyl; Y can be haloalkyl, nitroalkyl, halophenyl. such as 4-chlorophenyl and the R and R of the carbamoyl radical can be haloalkyl or halophenyl; and Z can be haloalkyl; nitroalkyl; haloalkenyl; haloalkynyl; haloaralkyl; such as 4-chlorobenzyl or nitroaralkyl such as 4-nitrobenzyl; halophenyl such as 3-chlorophenyl; hydroxyphenyl such as 3- hydroxyphenyl or alkoxyphenyl such as 4-methoxyphenyl.

Examples of suitable N-phenyl-hydroxylamines of formula [I which can be reacted with the chlorothioformate of formula Ill to prepare the compounds of formula I where Y is hydrogen include: N4-chlorophenyl-hydroxylamine, N-3- chlorophenyl-hydroxylamine, N-3,4-dichlorophenylhydroxylamine, N-2,4,6-trichlorophenyl-hydroxylamine, N-4- bromophenyl-hydroxylamine,N4-methylphenyl-hydroxylamine, N-3methylphenyl-hydroxylamine, N-4-ethylphenylhydroxylamine, N-3,4-dimethylphenyl-hydroxylamine, N-4- chloromethylphenylhydroxylamine, N-4- trifluoromethylphenyl-hydroxylamine, N-4-hydroxchlorothioformate, 4-chlorobutyl chlorothioformate, vinyl chlorothioformate, propen-Z-yll chlorothioformate, 4- chlorobuten-3yl-l chlorothioformate, propyn-2-yl-l chlorothioformate, butyn-Z-yl-l chlorothioformate, 2- chlorobutyn-S-yl-l chlorothioformate, cyclopentyl chlorothioformate, cyclohexyl chlorothioformate, cyclohexen-3-yl chlorothioformate, phenyl chlorothioformate, 4- chlorophenyl chlorothioformate, benzyl chlorothioformate, or 4-chlorobenzyl chlorothioformate.

In effecting the preparational reaction of the N-phenyl hydroxylamine of formula ll with the ester of chlorothioformic acid of formula III, the conditions and procedures used can be widely varied. Typically, the reaction can be effected by simply reacting the chlorothioformate with the desired N- phenyl hydroxylamine preferably in the presence of a suitable inert solvent such as dioxane or quinoline, water, and an acid acceptor such as an alkali metal carbonate or bicarbonate such as sodium bicarbonate. In conducting the reaction it is generally preferable to slowly add the chlorothioformate to a mixture of the N-phenyl hydroxylamine, solvent and acid acceptor maintained at a low temperature of the order of about lO to 5 C. The ratio of the reactants is not usually important and a stoichiometric quantity of the chlorothioformate and the N-pheynl hydroxylamine may be suitably used. when the reaction is complete, the desired produce can be recovered and purified by conventional techniques including filtration and recrystallization. As indicated, when thiocarbamates of formula I are desired where Y is other than hydrogen, then the Nphenyl-Nhydroxy-thiocarbamate prepared as above can be further reacted to obtain the desired Y-substituted thiocarbamate. When reacting the N-phenyl-N- hydroxy-thiocarbamate with a suitable isocyanate or carbamoyl chloride or O-alkylating with an appropriate alkylat- EXAM PLE 3 n-Propyl N-4-methylphenyl-N-hydroxy-thiocarbamate was prepared by charging l2.3 grams (0.1 mol) of N-4- ing agent, the conditions and procedures used can be widely 5 methylphenyl hydroxylamine, 12 grams of sodium bicarvaried. Typically, however, the conditions and procedures bonate, 80 ml. of dioxane and 20 ml. of water to a reaction which are commonly used for such reactions can be suitably flask. With stirring, 13.8 grams (0.] mol) of n-propyl employed. Examples of the compounds of this invention chlorothioformate were slowly added over a period of about represented by formula I, which can be thus prepared include: 20 minutes with the temperature maintained at about to methyl N-3,4-dichlorophenyl-N-hydroxy-thiocarbamate, m C. After stirring for about one-half hour, the reaction mixture propyl N-4-chlorophenyl-N-hydroxy-thiocarbamate, 4- was combined with ice water and stirred for about 15 minutes chlorobutyl-l N-3- methylphenyl-N-hydroxy-thiocarbamate, more. The solids which formed were recovered. dried and propen-Zyl-l N-4'-chloro-3'-methoxyphenyl-N-hydr0xyrecrystalized from hexane in the presence of charcoal to yield thiocarbamate, cyclopentyl N-phenyl-N-hydroxy-thiocarba- 5 12.0 grams of a white-colored product having a melting point mate, phenyl N-4'-acetylphenyl-N-hydroxy-thiocarbamate, 4- of 74 to 75 C. Analysis for C H N0 5: chlorophenyl N 3', 4-dichlorophenyl-N-hydroxyll-thiocarbamate, benzyl N-4"methoxyphenyl-N-hydroxy-thiocarbamate, 4-methoxyphenyl N-3'-nitrophenyl-N-hydroxy-thiocarbac H S mate, butyn-3-yl-l N-3, 4"-dimethylphenyl-N-methoxythiocarbamate, ethyl N-4-chl0rophenyl-N-methoxyl-thiocar- Theoretical is: 58.69 6.72 I4 22 bamate, benzyl N4'-tnfluoromethylphenyl-N-ethoxy-thiocar- Found 5834 N bamate, isopropyl N-4-formyloxyphenyl-N-carbamoyloxythiocarbamate, butyn-3-yl-l N-3,4-dichlorophenyl-N-carbamoyloxy-thiocarbamate, ethyl N-3-methyl-4-ch1orophenyl- 25 N-(N,N'-dimethylcarbamoyloxy)-thiocarbamate, or EXAMPLE 4 isopropyl N-4-chlorophenyl-N-(N-4-chlorophenylcarbamoloxy)-thiocarbamate. nPr0pyl N-4-chlorophenyl-N-hydroxy-thiocarbamatc was The preparation of the compounds of this invention can be prepared by charging L43 grams (O.l mol) of N-4- illustrated by the following examples: chlorophenyl hydroxylamine, 12.0 grams of sodium biear bonate, 80 ml. of dioxane and 20 ml. of water to a reaction EXAMPLE 1 flask. With stirring, l3.8 grams (0.1 mol) of n pr0pyl Methyl N 4 methylphenvLN hydmxy thiocarbamate was chlorothioforrnate were slowly added over a period of about prepared by charging {23 grams (OJ mol) of 20 minutes with the temperature maintained at about 0 to 5 methylphenyl hydroxylamine 12 grams of Sodium bicap C. After stirring torabout one'half hour, the reaction mixture bonate, 80 grams of dioxane and 20 grams of Water to a Team was combined with ice water and stirred for about 15 minutes tion flask. With stirring, about 1 1.0 grams (0.1 mol.) of methyl more h Sohds winch formed were j f dnedi and chlomthioformate were Slowly added over a period of about recrystallized from a benzene-hexane mixture in the presence 20 minutes with the temperature maintained at about 0 to 5 of fharcoal w grams of a wh'te'colored P F C. After stirring for about one-half hour, the reaction mixture 40 havmg a mehmg pomt of to Anaiys's for was combined with ice water and stirred for about 15 minutes CWHWCNOzS: more. The solids which formed were recovered, dried, recrystallized from hexane in the presence of charcoal to yield 9.1 grams of a white-colored product having a melting point of c H s 88 to 89 C. Analysis for C H,,NO S:

Theoretical s: 43.92 4.93 13.04

c H 5 Found 48.77 5.08 11.01

Theoretical 54.78 5.58 16.23 Found 54.68 5.92 16.14

- EXAMPLE 5 EXAMPLE 2 Methyl N-3-chloro-4-methylphenyl-N-hydroxy-thiocarba- Methyl f mate was prepared by charging 15.5 grams (0.] mol) of N-3- prepared by chargmg grams (0'044 W of chloro-4-methylphenyl hydroxylamine, 12 grams of sodium dimehylpbenyl'hydmxylammei5 grams P carbonaiei bicarbonate 80 grams of dioxane and 20 grams of water to a 59 ml. of dioxane, and 15 ml. of water to a reaction flask. With reaction flask. With stirring, 11 grams (0.1 mol) of methyl Surfing grams (0A4 of methyl 'Q' Q chlorothioformate were slowly added over a period of about 60 were Slowly W a Pcnod i 20 mmule? i 20 minutes with the temperature maintained at about 0 to 50 temperature maintained at about 0 to 5 C. After stirring for C. After stirring for about one-half hour, the reaction mixture fibout h reacuon mlxiure was combmed m was combined with ice water and stirred for about 15 minutes and Stirred for mmutes more T Sohds more The Solids which formed were recovered, dried and which formed were recovered, dried and recrystallized from recrystallized from hexane in the presence ofcharcoal to yield benzene to Y' grams f a whltefgolored crysiaume l4.7 grams of a pale-yellow-colored product having a melting Product i a mcnmg Pomt of 1 point of 134 to 135 0. Analysis for C H ClNO S: CIOHIJNOBZS- c H s c H 5 Theoretical iii: 46.7l 4.35 46.7l Theoretical 56.83 6.20 l5.l7 Found at; 46.66 4.61 13.92 Found 71:: 57.31; 6.29 15 i2 EXAMPLE 6 Methyl N-4-chlorophenyl-N-hydroxy-thiocarbamate was prepared by charging 14 grams (0.1 mol) of N-4-chlorophenyl-hydroxylamine, 12 grams of sodium bicarbonate, 80 ml. of dioxane and 20 ml. of water to a reaction flask. With stirring 1 1.0 grams (0.1 mol) of methyl chlorothioformate were slowly added over a period of about 20 minutes with the temperature maintained at about to C. After stirring for about onehalf hour, the reaction mixture was combined with ice water and stirred for about minutes more. The solids which were formed were recovered, dried and recrystallized twice from benzene to yield 3.7 grams of a tan-colored, crystalline product having a melting point of 143 to 145 C. Analysis for C H CINO,S:

C H C1 Theoretical 1:: 44.18 3.71 16.31

Found 44.60 3.83 I612 EXAMPLE 7 Methyl N-3-chloro-4methylphenyl-N-methoxylthiocarbamate was prepared by charging 5.0 grams (0.028 mol) of methyl N-3-chloro-4-methylphenyl-N-hydroxy-thiocarbamate (as prepared in example 2), 30 ml. of dioxane, ml. of water and 7.5 grams of potassium carbonate to a reaction flask. With the temperature maintained at about 34 C., 3.0 grams (0.024 mol) of dimethyl sulfate were added. The mixture was stirred for about one-half hour and then was combined with ice water. The resulting solids were recovered and recrystallized from pentane and dried to yield 4.9 grams of a crystalline product having a melting point of 35 to 37 C. Analysis for c,,,H,,,cNo s;

C H S Theoretical in 48.92 4.93 13.04

Found 48.58 5.08 12.96

EXAMPLE 8 n-Propyl N-4-methylphenyl-N-methoxy-thiocarbamate was prepared by charging 5.0 grams (0.0238 mol) of n-propyl N-4 methylphenyl-N-hydroxy-thiocarbamate (as prepared in example 2), 30 ml. of dioxane, 20 n1. of water and 3.6 grams of potassium carbonate to a reaction flask. With the temperature maintained at about 26 to 31 C., 3.0 grams (0.0238 mol) of dimethyl sulfate were added. The mixture was stirred for about one-half hour and then combined with ice water. The resulting solids were recovered and recrystallized from pentame to yield the product.

EXAMPLE 9 pesticides and particularly as fungicides and nematocides. As

used herein the term pesticide includes both fungicides and nematocides.

For practical use as pesticides, the compounds of this invention are generally incorporated into pesticidal compositions which comprise an inert carrier and a pesticidally toxic amount of such a compound. Such pesticidal compositions, which can also be called formulations, enable the active compound to be applied conveniently, in any desired quantity, to the site of the pest infestation. These compositions can be solids such as dusts, granules, or wettable powders, or they can be liquids such as solutions, aerosols, or emulsifiable concentrates.

For example, dusts can be prepared by grinding and blending the active compound with a solid inert carrier such as the talcs, clays, silicas, pyrophyllite, and the like. Granular formulations can be prepared by impregnating the compound. usually dissolved in a suitable solvent, onto and into granulated carriers such as the attapulgites or the vermiculites. usually of a particle size range of from about 0.3 to 1.5 mm. Wettable powders, which can be dispersed in water and/or oil to any desired concentration of the active compound. can be prepared by incorporating wetting agents into concentrated dust compositions.

ln some cases, the compounds are sufficiently soluble in common organic solvents such as kerosene or xylene so that they can be used directly dissolved in such solvents. Frequently, these solutions can be dispersed under superatmospheric pressure as aerosols. However, preferred liquid pesticidal compositions are emulsifiable concentrates, which comprise one or more compound according to this invention and as the inert carrier, a solvent and an emulsifier. Such emulsifiable concentrates can be extended with water and/or oil to any desired concentration of the compound for application as sprays to the site of the pest infestation. The emulsifiers most commonly used in these concentrates are nonionic or mixtures of nonionic with anionic surface-active agents.

A typical pesticidal composition according to this invention is illustrated by the following example, in which the quantities are in parts by weight.

EXAMPLE 10 Product of Example 1 Powdered Talc The above ingredients are mixed in a mechanical grinderblender and are ground until a homogenous, free-flowing dust of the desired particle size is obtained. This dust is suitable for direct application to the site of the pest infestation.

The compounds of this invention can be applied as pesticides in any manner recognized by the art. One method for destroying pests comprises applying to the locus of the pest infestation a pesticidal composition comprising an inert carrier and as the essential active ingredient, in a quantity which is toxic to said pests. The concentration of at least one of the compounds of this invention individually or in admixture in the pesticidal compositions will vary greatly depending on the type of formulation and the purpose for which it is designed, but generally the compositions will contain from about 0.05 to about percent by weight of the compounds of this invention. in a preferred embodiment of this invention, the pesticidal compositions will contain from about 5 to 75 percent by weight of the compound. The compositions can also contain additional substances such as other pesticides, stabilizers, spreaders, deactivators, adhesives, stickers, fertilizers, or activators.

When the compounds of this invention are used as agricultural fungicides, they can be applied to plant foliage. to seeds. to the soil, or to such parts of plants as the fruits themselves. Plants are susceptible to a great many diseases which cause widespread damage; and among some of the more important which can be mentioned are late blight on tomato, powdery mildew on cucumber (Erisiphe cichomcearum), cereal leaf on wheat (Puccinia rubigo-vera), and such common soil fungi as fusarium wilt (Fusarium oxysporum), the seed rot fungus (Phythium debaranum), and the sheath and culm blight (R- hizoctonia solani). The new compounds of this invention can also be employed as industrial fungicides to control a variety of fungi which attack such materials as adhesives, cork, paints, lacquers, leather, wood, plastics, and textiles such as cotton and wool.

The quantity of active compound of this invention to be used for good disease control will depend on a variety of factors, such as the particular disease involved, the intensity of the infestation, formulation, weather, type of crop and the like. Thus, while the application of only 1 or 2 ounces of active compound per acre of a crop may be sufficient to control a light infestation of certain fungi, a pound or more of active compound per acre may be required to control a heavy infes tation of a hardy species of fungus.

When the compounds of this invention are used as nematocides to control or prevent infestations of destructive nematodes, they are ordinarily used as soil treatments. Plant parasitic nematodes occur in enormous numbers in all kinds of soil in which plants can grow, and many plant pathologists believe that all the crop and ornamental plants grown in the world can be attacked by these nematodes. The destructive species of nematodes range from the highly specialized, which attack only a few kinds of plants, to the polyphagous, which attack a great many different plants. The plants almost invariably become infected by nematodes that move into them from the soil The underground parts of plants, roots, tubers, corns, and rhizomes are thus more apt to be infected than aboveground parts, but infection of stems, leaves, and flower parts is also fairly common.

Damage to plants attacked by nematodes is due primarily to the feeding of the nematodes on the plant tissues. The nematodes may enter the plant to feed, may feed from the outside, or be only partially embedded. The feeding of a nematode may kill the cell or may simply interfere with its normal functioning. if the cell is killed, it is often quickly invaded by bacteria or fungi. If the cell is not killed, it and the adjacent cells may be stimulated to enlarge or multiply. Hence, the most common types of nematode damage are manifested as rotting of the attacked parts and adjacent tissue or the development of galls and other abnormal growths. Either can interfere with the orderly development of the plant and cause shortening of stems or roots, twisting, crinkling or death of parts of stems and leaves, and other abnormalities. Consequently, the yield of crop plants is reduced, while a highquality crop cannot be produced from the crippled plants.

The use of the compounds of this invention for nematode control can make the difference between a good crop and one not worth harvesting. Once the nematodes are controlled, yield increases of 25 to 50 percent are not uncommon. The solid or liquid nematocidal compositions of this invention can be applied to the soil, or in some cases to the plants and soil, in any convenient manner. While broadcast applications to the soil before planting by conventional plow or disc methods are effective. specialized methods such as row placement application. split-dosage applications, postplanting sidedress applicatrons. and the like are also useful. The active compounds of this invention are applied in amounts sufficient to exert the desired nematocidal action. The amount of the active compound present in the nematocidal compositions as actually applied for preventing or controlling nematode infestations varies with the type of application, the particular species which are to be controlled, and the purpose for which the treatment is made.

The compounds of this invention can be combined with different fungicides or nematocides or combinations thereof to form either synergistic pesticide compositions or pesticide compositions capable of more than pesticidal activity such as a pesticidal composition having both fungicidal and nematocidal activity. For example, the compounds may be combined with fungicides such as ferbam, nabam, zineb, ziram, thiram, chloranil, dichlone, glyodin, cycloheximide, dinocap, maneb, captan, dodine, p-dimethylaminobenzenediazo sodium sulfonate and with nematocides such as chloropicrin, 0,0-

diethyl 0-(2,4-dichlorophenyl) phosphorothioate, tetrachlorothiophene, dazomet, or dibromochloropropane.

The pesticidal activity of the compounds of this invention can be illustrated by the following examples.

EXAMPLE ll The fungicidal activity of the compounds of this invention can be demonstrated by the following.

An emulsifiable concentration containing the test com pound at a rate of 25 mg. per ml. was prepared by dissolving the compound in a suitable solvent such as acetone containing a surface active agent (polyoxyalkylcne derivatives of sorbitan 1,000 and/0r monoleate, 2.48 mg. per ml. of acetone.

The compounds were used to control the fungus Puccinia rubigo-vera (Leaf rust of wheat). An aqueous fungicidal composition was prepared by admixing the above prepared emulsifiable concentrate with sufficient water to provide a conccntration of 1,000 p.p.m. by weight of the test compound. A series of 7-day-old Henry wheat plants were treated with the fungicidal composition by spraying the plants for a period of about 30 seconds at a spray pressure of 80 pounds per square inch. Another series of plants were not so treated and were used for comparative purposes. After the treated plants had dried, both the treated and untreated plants were inoculated with a 9- to l3day-old culture of the fungus. The plants were then stored under conditions favorable to fungus growth for a period of about 8 days. At the end of the period the plants were examined to determine the extent of fungus growth. The growth of the fungus on the treated plants was measured and rated in comparison with the untreated plants. The results of the test are as follows:

Percent Control Test Compound Cone. Test Compound p.p.m.

The compounds were used to control the fungus Phytophthora infestans (tomato late blight fungus). An aqueous fungicidal composition was prepared as above to provide a concentration of 1,000 ppm. by weight of the test compound. Susceptible species of tomato plants growing in soil in individual paper pots were treated by spraying with fungicidal composition when they had grown to a height of approximately 6 to 8 inches. Some of the plants were not sprayed and were used for comparative purposes. After the sprayed plants had dried, both series of plants were sprayed with a suspension of the fungus spores which had been reared on lima bean agar. After a few days to 1 week, disease symptoms in the treated plants were observed and rated in comparison to the untreated plants. The results of the test are as follows:

Pc rcent Control Tcst Compound Cone. Test Com ound p.p.m. by weight Methyl N 3-chloro-4- methyl henyLNhydroxy A compound was used to control the fungus, Erysiphe cichoracearum, powdery mildew fungus. A fungicidal composition was prepared as above having a concentration of 1,000 p.p.m. by weight. Susceptible species of cucumbers were grown in soil in plastic pots with two to three plants per pot. After the cucumber plants were 10 to 14 days old, they were sprayed with fungicidal composition. Another series of plants was not sprayed and was used for comparative purposes. After the sprayed plants had dried, each plant in both series were surrounded by three plants infested with the powdery mildew fungus. After 9 to 14 days, the extent of the disease was observed and rated in comparison with the untreated plants. The results of the test are as follows:

The nematocidal activity of the compounds of this invention can be illustrated by the following:

The compounds were used to control rootknot nematodes. A sample of inoculated soil was prepared by mixing one part of sand, four parts of sterilized soil and three parts of soil from a 4-month-old rootknot nematode culture (Meloidogyne spp.). A portion of the soil sample was treated by mixing a measured amount of the emulsifiable concentrate as prepared in example H in an amount sufficient to provide the soil with the desired concentration of the compound. Another portion of the soil was not so treated and was used for comparative purposes. The treated soil as well as the untreated soil was placed into a series of plastic bags contained in glass mason jars. The jars were sealed and stored at 70 F. for a period of about 7 days. At the end of this period, the soil was transferred to plastic pots and tomato seedlings (Bonny Best) were planted in the soil. After 20 days, the soil was washed from the tomato plants and the number of rootknot nematode galls on the plants were counted. The degree of the nematode control of the test compound was evaluated on a percentage basis in comparison to the degree of galling in the untreated plants. The results of the tests are as follows:

Cone. Test Compound Percent Test Compound lbs. per 4 Inch Acre Control D-PrDp \l .\-4-

cblorophenyl- Xhflrory-thiocarbamate 100 90.4 Methyl NJ-chloropheynyl 100 100.0 .s' hydroxy-throcarbamate Methyl N4-chlorophenyl 40 95.5

series of pots was not so treated was used for comparative purposes. Both series of pots were placed in a greenhouse and held for 7 days and then 10- to l4-days-old tomato seedlings (Bonny Best) were planted in the pots. After about 2 weeks. the degree of nematode control was evaluated by comparing the number of rootknot nematode galls on the roots of the plants grown in the treated soil with the number of the galls on the plants grown in the untreated soil. The results of the test were as follows:

5 1 a We. a.

wherein n is an integer of from 0 to 3; X is selected from the group consisting of a halogen; an alkyl, haloalkyl, hydroxyalkyl and nitroalkyl of one to five carbon atoms; nitro; formyl; acetyl; haloacetyl', formyloxy; acetyloxy; haloacetyloxy; hydroxy and alkoxy of one to five carbon atoms; Y is selected from the group consisting of hydrogen; phenyl; hulophenyl: al kylphenyl wherein the alkyl substitucnts are ofone to five carbon atoms; hydroxyphenyl and a carbamoyl radical of the formula wherein R and R independently are selected from the group consisting of hydrogen; alkyl and haloalkyl of one to five carbon atoms; phenyl and halophenyl; and Z is selected from the group consisting of alkyl, haloalkyl, and nitroalkyl of one to five carbon atoms; alkenyl, haloalkenyl, alkynyl, and haloalkynyl of two to five carbon atoms; cycloalkyl or cycloalkenyl of from five to seven carbon atoms.

2. The compound of claim 1 wherein Y is hydrogen.

3. The compound of claim 1 wherein Z is selected from the group consisting of alkyl of one to about five carbon atoms, alkenyl and alkynyl of from two to about five carbon atoms.

4. The compound of claim 3 wherein Z is alkyl of from one to about five carbon atoms.

5. The compound of claim 1 wherein Z is selected from the group consisting of alkyl of from one to about five carbon atoms.

6. The compound of claim 1 wherein it is methyl N4- methylphenyl-N-hydroxy-thiocarbamate.

7. The compound of claim 1 wherein it is methyl N-3- chloro-4-methylphenyl-N-hydroxy-thiocarbamate.

8. The compound of claim 1 wherein it is n-propyl N-4- methylphenyl-N-hydroxy-thiocarbamate.

9. The compound of claim 1 wherein it is n-propyl N-4- chlorophenyl-N-hydroxy-thiocarbamate.

10. The compound of claim 1 wherein it is methyl N-2,odimethylphenyl-N-hydroxy'thiocarbamate.

22 3 33 UNITED STATES PATENT OFFICE CERIIFICATE OF CORRECTION 3, 9,175 Dated September 28, 1971 Patent No.

Inventor(s) Sidney B. Richter It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

line 72 in the table under "s" for "46.71"

Column 5,

read --l5.85--.

Column 4, line 29 for "1.43" read --l +.5--

Column i, line 67 for "C H NOB2S read --C H NO S-- line 45 delete "6dimethylphenyl-N-hydr'oxy- Column 8,

thiocar'bamate".

Column 10, line 55 for "2' read --X-.

Signed and sealed this 28th day of March 1972.

(SEAL) Attest:

ROBERT GOTTSCHALK 

2. The compound of claim 1 wherein Y is hydrogen.
 3. The compound of claim 1 wherein Z is selected from the group consisting of alkyl of one to about five carbon atoms, alkenyl and alkynyl of from two to about five carbon atoms.
 4. The compound of claim 3 wherein Z is alkyl of from one to about five carbon atoms.
 5. The compound of claim 1 wherein Z is selected from the group consisting of alkyl of from one to about five carbon atoms.
 6. The compound of claim 1 wherein it is methyl N-4-methylphenyl-N-hydroxy-thiocarbamate.
 7. The compound of claim 1 wherein it is methyl N-3-chloro-4-methylphenyl-N-hydroxy-thiocarbamate.
 8. The compound of claim 1 wherein it is n-propyl N-4-methylphenyl-N-hydroxy-thiocarbamate.
 9. The compound of claim 1 wherein it is n-propyl N-4-chlorophenyl-N-hydroxy-thiocarbamate.
 10. The compound of claim 1 wherein it is methyl N-2,6-dimethylphenyl-N-hydroxy-thiocarbamate. 